Hair iron



FIG. 1 is a perspective view of a hair iron showing my new design;

FIG. 2 is a right side elevational view thereof; the side opposite being a mirror image of the side shown;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a hair iron, as shown and described. 